Now, getting the boot loader re-installed and the OS configured as needed can be done after a normal installation, but that is what I referred to above as being a bit tricky sometimes it's a matter of trial-and-error. There is often an additional complication caused by what the bios puts in the hardware map it creates there is no standard for this and this can result in the boot loader being confused. So the OS installation on the USB must be forced to boot from the MBR on that device, plus the boot loader must be configured to think it is the first boot device (which it will be when you do the bios switch) plus the partition mounting must be configured to use a unique identifier of the USB device rather than the bios's device sequencing. Here is the key: When both the internal disk and the USB are connected, any OS installation (incl Windows) will see both, will see the USB as the second storage device, and will see the internal disk as the boot device (this is the fundamental reason you had the difficulty you did before). Is this possible for you to do? Generally speaking the DVD is better, but the LiveCD will probably work, too. The easiest approach usually is to connect the USB but disconnect the internal disk drive and then boot the installation media. I'll try to explain in detail since this is not familiar, don't hesitate to ask for any clarification or elaboration. It's certainly possible as long as the USB device is seen and bootable by the bios and can be installed to, but can be a bit tricky.
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